Delong offers a good retort of the issue of inequality but I quibble a bit with this
This kind of inequality should be a source of concern. Bill Gates, Paul Allen, Steve Ballmer, and the other hundred-millionaires of Microsoft are brilliant, hard-working, entrepreneurial, and justly wealthy. But only the first 5% of their wealth can have any justification as part of an economic reward system to encourage entrepreneurship and enterprise. And the last 95% of their wealth? It would create much more happiness and opportunity if divided evenly among the citizens of the United States or the world than if they were to consume any portion of it.
But as a rule Bill Gates and company will not consume more than 5% of their wealth. Indeed, I wonder if they will consume even 5%
The rest will remain as perpetual capital, and fuel the consumption of the heirs or charities they designate. In either case the wealth will be spread over hundreds if not thousands of people.
The idea that capitalists are benefiting at the expense of workers is largely unfounded. As DeLong points at latter, skilled workers are benefiting and the expense of the unskilled. This is the problem we need to focus on. This is the problem that needs to command our attention.